batgrbproduct analysis for trigger=922968

batgrbproduct Analysis for Trigger=922968

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Wed Oct  9 17:44:36 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger922968
======================================================================

  Trigger: 00922968      Segment: 000

  BAT Trigger Time: 588801428.096   [s; MET]
      Trigger Stop: 588801429.12   [s; MET]
               UTC: 2019-08-29T19:56:44.601720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 44.5397196710187   Dec: -8.96781199714715  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.51
     Image Trigger?:     NO
     Rate S/N Ratio:     23.7065391822594  [ if not an image trigger ]
     Image S/N Ratio:    8.51

  Flight Position:   [ source = BAT ]
    RA: 44.5397196710187   Dec: -8.96781199714715  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 44.5418653954335   Dec: -8.95789022098407  [deg; J2000]  
        { 02h 58m 10.0s , -08d 57' 28.4" }
         +/- 1.9303553917174 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.968985195904689 [arcmin] (formal 1-sigma fit error)
    SNR: 11.886804852414
 
  Angular difference between Flight and Ground position is 0.608738 arcmin
 
  Partial Coding Fraction: 0.04248047    [ including projection effects ]

  Duration
     T90: 56.8959999084473 +/- 47.0011049601117
        Measured from: -50.5519999265671
                   to: 6.34399998188019     [s; relative to TRIGTIME]
     T50: 4.28799986839294 +/- 1.31784066564192
        Measured from: -1.71999990940094
                   to: 2.567999958992     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0119999647140503     
                   to: 0.98800003528595     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -51.8959999084473     
                   to: 7.24000000953674     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.596365   4.613677   1.547082  -0.122486
           0.382614   0.391842   0.333390   0.318171 [error]
 Peak      0.816761   0.588829   0.174093   0.033045
           0.088826   0.082323   0.054750   0.043576 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1    Band2    Band3    Band4    Band5    Total      
                       15-25    25-50   50-100  100-350   15-150   15-350   keV
Fluence   Power-law 2.19e-06 2.12e-06 1.44e-06 1.52e-06 6.39e-06 7.27e-06   erg/cm2
              Error 2.88e-07 2.27e-07 3.03e-07 6.05e-07 7.23e-07 1.04e-06   erg/cm2
Peak flux Power-law 1.23e+01 4.56e+00 9.70e-01 2.46e-01 1.80e+01 1.81e+01   ph/cm2/s
              Error 2.20e+00 7.87e-01 3.32e-01 1.46e-01 2.73e+00 2.73e+00   ph/cm2/s
 
Fluence   Cutoff-PL -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.564    0.213    -      -           1.06e-02 1.63e-03   52.980 57
CPL   1.370    1.109      18.9    0.0      5.95e-02 0.00e+00   49.250 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.232    0.331    -      -           5.50e-02 1.48e-02   58.280 57
CPL   1.000    0.000      80.0    0.0      1.07e-01 0.00e+00  131.660 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 4.672000 sec.
T50 in the 50-300 keV band: 2.560000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   59.136  -51.896    7.240
T90    56.896  -50.552    6.344
T50     4.288   -1.720    2.568
Peak    1.000   -0.012    0.988

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   44.5419    -8.9579   0.0161    53.0564   169.5545        11.4549532     11.887 TRIG_00922968                 
 
Foreground time interval of the image:
-51.896  12.005 (delta_t =  63.901 [sec])
Background time interval of the image:
-153.795 -51.896 (delta_t = 101.899 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -51.896 sec. to    7.240 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.56418     ( -0.205265   0.221602 )
Norm@50keV  : 1.05722E-02    ( -0.00163808   0.00161571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.98 using 59 PHA bins.
# Reduced chi-squared =         0.9295 for     57 degrees of freedom 
# Null hypothesis probability =   6.265477e-01
 
Photon flux (15-150 keV)    in 59.14 sec: 2.16162 ( -0.21713  0.21736 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.36796e-06 ( -7.16233e-07  7.29149e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -51.896 sec. to    7.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.36963     ( -1.57487   0.642839 )
Epeak [keV] : 18.8978      (   )
Norm@50keV  : 5.94836E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.25 using 59 PHA bins.
# Reduced chi-squared =         0.8794 for     56 degrees of freedom 
# Null hypothesis probability =   7.264320e-01
 
Photon flux (15-150 keV)    in 59.14 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Band function

Time interval is from  -51.896 sec. to    7.240 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 7.25630  (-0.717116  0.802749)
R^2/D10^2   : 3.45194  (-1.25671   1.97236)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.83 using 59 PHA bins.
# Reduced chi-squared =         0.9971 for     57 degrees of freedom 
# Null hypothesis probability =   4.813487e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.790e-06   3.007e-07
25- 50  2.625e-06   3.548e-07
50-150  4.946e-07   1.739e-07
15-150  4.910e-06   6.659e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 30.6061       (-6.24772      8.4265)
Norm        : 16.9165       (-3.45113     4.55221)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.22 using 59 PHA bins.
# Reduced chi-squared =         0.8634 for     57 degrees of freedom 
# Null hypothesis probability =   7.586482e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.057e-06   2.916e-07
25- 50  2.376e-06   2.883e-07
50-150  1.336e-06   4.447e-07
15-150  5.769e-06   7.289e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.06675        (-1.51051      1.10112)
R1^2/D10^2  : 6.35827        (-2.95272      10.0259)
kT2 [keV]   : 19.4565        (-14.8994      38.4446)
R2^2/D10^2  : 2.34384E-02    (-0.0228419   0.407888)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
# Reduced chi-squared =         0.8715 for     55 degrees of freedom 
# Null hypothesis probability =   7.391200e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.970e-06   6.012e-07
25- 50  2.408e-06   7.759e-07
50-150  1.580e-06   9.712e-07
15-150  5.958e-06   1.997e-06

Peak spectrum fit

Power-law model

Time interval is from   -0.012 sec. to    0.988 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.23166     ( -0.301917   0.360041 )
Norm@50keV  : 5.50036E-02    ( -0.0149091   0.0147579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.28 using 59 PHA bins.
# Reduced chi-squared =          1.022 for     57 degrees of freedom 
# Null hypothesis probability =   4.281806e-01
 
Photon flux (15-150 keV)    in 1 sec: 17.9964 ( -2.7245  2.7275 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.42027e-07 ( -1.16926e-07  1.17659e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.012 sec. to    0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00000     (     )
Epeak [keV] : 80.0000      (   )
Norm@50keV  : 0.106818    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         131.66 using 59 PHA bins.
# Reduced chi-squared =         2.3510 for     56 degrees of freedom 
# Null hypothesis probability =   4.936829e-08
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Band function

Time interval is from   -0.012 sec. to    0.988 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 6.10907  (-1.02002  1.11056)
R^2/D10^2   : 58.7752  (-31.43   78.9823)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.20 using 59 PHA bins.
# Reduced chi-squared =          1.091 for     57 degrees of freedom 
# Null hypothesis probability =   2.962433e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.990e-07   8.625e-08
25- 50  3.100e-07   8.560e-08
50-150  3.054e-08   1.749e-08
15-150  6.395e-07   1.629e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 19.5022       (-4.79757      6.08733)
Norm        : 223.452       (-69.8494     116.011)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.50 using 59 PHA bins.
# Reduced chi-squared =         0.9737 for     57 degrees of freedom 
# Null hypothesis probability =   5.314081e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.391e-07   7.130e-08
25- 50  2.912e-07   6.100e-08
50-150  8.357e-08   4.233e-08
15-150  7.139e-07   1.335e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.15792        (-1.6598      1.99121)
R1^2/D10^2  : 905.732        (-806.165      154401)
kT2 [keV]   : 8.73259        (-2.28048      5.30746)
R2^2/D10^2  : 8.22301    (-7.74501   32.4566)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.91 using 59 PHA bins.
# Reduced chi-squared =         0.9984 for     55 degrees of freedom 
# Null hypothesis probability =   4.780387e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.513e-07   1.926e-07
25- 50  2.835e-07   1.527e-07
50-150  8.468e-08   5.640e-08
15-150  7.195e-07   3.564e-07

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.56418     ( -0.205265   0.221602 )
Norm@50keV  : 1.05722E-02    ( -0.00163808   0.00161571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.98 using 59 PHA bins.
# Reduced chi-squared =         0.9295 for     57 degrees of freedom 
# Null hypothesis probability =   6.265477e-01
 
Photon flux (15-150 keV)    in 59.14 sec: 2.16129 ( -0.217083  0.217319 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.3663e-06 ( -7.15961e-07  7.29261e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.36835     ( -1.57406   0.628711 )
Epeak [keV] : 18.9147      ( -16.3372 9.89541 )
Norm@50keV  : 5.95967E-02    ( -0.0598652   0.583037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.25 using 59 PHA bins.
# Reduced chi-squared =         0.8794 for     56 degrees of freedom 
# Null hypothesis probability =   7.264317e-01
 
Photon flux (15-150 keV)    in 59.14 sec: 2.07730 ( -0.22876  0.22906 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.77152e-06 ( -7.83014e-07  8.70139e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 2.12e-06
S(50-100 keV) = 1.44e-06

T90 vs. Hardness ratio plot

T90                                   = 56.8959999084473 sec.
Hardness ratio (energy fluence ratio) = 0.679245

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.00377
Count Ratio (50-100 keV) / (15-25 keV) = 0.336588

Mask shadow pattern

IMX = -1.307727448355517E+00, IMY = -2.410857632435768E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-153.795410 -51.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
342.9171 -29.1791    2.4  39.3   81.9   4.0342   4.8 ------	UNKNOWN                       
338.3553 -30.9460    2.4  39.9   75.2   4.5459   4.8 ------	UNKNOWN                       
 27.1653 -14.1734    2.4  44.9  148.5   4.4040   4.8 ------	UNKNOWN                       
303.6921 -50.3429    2.5  42.9   25.7   1.8258   4.6 ------	UNKNOWN                       
 16.5381 -48.7423    2.4  10.4  124.0   1.1339   4.9 ------	UNKNOWN                       
 65.4878 -32.7404    2.4  39.5 -151.7   1.6657   4.8 ------	UNKNOWN                       
 89.7463 -72.3481    2.8  29.3  -75.6   1.2521   4.1 ------	UNKNOWN                       
 86.3455 -61.0966    2.7  31.5  -97.7   1.4761   4.3 ------	UNKNOWN

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-51.896000 7.240000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 44.5426  -8.9549    1.1  53.1  169.6  11.3343  11.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
86.004600 662.984000
720.904000 963.024000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 23.7252  28.2696    3.0  42.3  158.7  14.8415   3.8 ------	UNKNOWN                       
 53.9167  29.3317    3.5  39.4 -160.7   7.8039   3.3 ------	UNKNOWN                       
 66.2059 -12.7564    2.3  21.6  -71.7   8.9953   4.9 ------	UNKNOWN                       
 74.6902  -9.1561    2.6  29.8  -80.9   9.6354   4.4 ------	UNKNOWN

Plot creation:
Wed Oct  9 17:57:49 EDT 2019